Industrial power unit



Get. 27,1936. l 1'.l c-QDELAvAgcRow `2,058,571?- v, iNDUsTRIAL POWER UNIT E ww uw SMM/kw get, 27, 1936. g `1'. c. DELAvAL-cnovy 2,058,572

' INDUSTRIALPOWER UNIT Filed May 2'?, 1535 2 sheets-Sheet 2 Patented Oct. 27, i936 l PTENT lOFFICE l cessata ns'rnrnr. 'rowers tinta Thomas C. Delavai-Crow, hristol, Conn., assigner to General Motors Corporation, Detroit, Mich., a corporation ci Delaware Application May 2t, 31935, Seriairiio. 25,561 Si im. litt-m36) This invention relates to an 'industrial'power unit including a motor and a ratio-changing mechanism.

lits object is to eect a cooling of the combined unit.

.e further object is to provide for cooling of the combined-motor and change speed mecha nism by an air current produced by a ian rotating at the most advantageous rate.

Other objects and advantages will ice under-2 stood from the following description.

the drawings:

Fig. i is a view in side elevation, partly broken away and in section.

Fig. 2 is a section on line 2 2 or Fig. l..

Fig. 3 is a section on line t--S ci l.

i is a view in end' elevation. from the right end oi i.

The drawings show a motor having a suirounding wall il and associated therewith a variable speed transmission designated as a Whole ich numeral il. The two parts are secured together by fastening means i i and the combined units are supported by a leg i encompassing; .danges i and on the change speed casting iii and at tached to a flange it thereof by fastening means 2li. Numeral 253 is the motor shaft and is an extension shaft rotatable therewith.'` Surrounding shafts 23 and 25 is a sleeve Eil rotatable with these aligned shafts and operable by means, not shown, to rotate an input race ot a variable speed transmission. Sleeve 2i is journaled in the casting i@ by antfriction bearings 3i. it. ring 33 is secured to the casting by fastening means 35 i and between the ring and a spacer il? is packing means 3Q. The hub of a fan di is lreyed to the sleeve and clamped in position by a threaded nut 133. By this arrangement the fan rotates with the motor shaft. v

Driving race 29 surrounds the driven shaft til, a reduced forward end of which is marked 135 in Fig; 3. It rotates a driven race, not shown, by means of rollers, one of which is marked 5l. The transmission details are not, per se, a part of this invention and have not been illustrated more than as described. The casting lli is formed with a plurality of passages 49 having axial and radial components and extending from a position adjacent the periphery of the casting to a position adjacent the fan as shown by Fig. 1. To the end of the casting I0 remote from the motoris a. cover 5I secured by fastening means 53. The casting is generally circular in outline, a portion of its outer periphery appearing in Fig. l where an outer shell 5t is broken away. Extending ont1 wardly from the casting are pairs o radial ribs 5d and the fastening means 53.extends between the ribs of the pairs. The spaces iii between the pairs of ribs and between the casting the shell 53 are shown in Figs. 3 and "ihese spaces register with the passages til. The cover Vdi has openings 5l and passages therewithin to communicate with spaces d i. To the cover is secured. a cap tl by fastening means Si?. 'it will be observed that the construction of the casting is such that two or the cover passages (at top and bot-n tom) are in engagement with a blank face ci? the casting and are therefore inoperative, but that there are four spaces iii operative to provide contz duits from the cover opening to the Although not a part ci this invention, there is shown a housing to be supplied with oil by a pipe 65 from any suitable pump 5d. This housing 63 is to constitute a control box for changing, by means of Huid pressure, the positions of the rollers lil and therefore theratio of transmission. The fan is operable to draw air through openings 5i, through spaces 6i around the transmission, then to force the air around the motor within its wall d and out through suitable openings such as till and in this way' both. the transmission and motor are lrept cool.

By securing the ian for rotation with, the motor shaft a uniform rotation is secured. This is to be preferred for, were the ian carried by the driven shaft ci the change speed unit, it would rotate too rapidly when the ratio of the transmission is in high and too low for efficient cooling when the transmission is set for low ratio.

The location on the motor shaft therefore affords-a better average cooling. The arrangement Awhereby the fan cools the motor as well as the transmission is desirable, particularly when the unit is operating with overload for any considerable length of time.

I claim: A

A motor, a coaxial change speedV transmission, a fan secured to the shaft of the motor, said transmission having a circular wall, circumferentially spaced pairs of radial ribs projecting therefrom, a shell surrounding said wall and engaging said ribs to form air spaces, an end. cover having inlet passages communicating with said spaces, said motor having a surrounding wall and outlets whereby said fan rotates at motor speed and draws air from over said transmission and delivers it over said motor to said outlets.

THOMAS C. DELAVAL-CROW. 

